Action Strip component

[StefanIvanov]

Create a new component that can be templated to show a set of actions contextual to the component over which it is shown.

Spec: https://github.com/IgniteUI/igniteui-angular/wiki/Action-Strip-Component

Sub-tasks:

• README for the feature

• Changelog

• Implement base grid action component which should be inherited by all pinning and editing grid action components

• Restrict grid action usage outside of a grid context. Those actions should not appear if they don't have defined grid

• Styling ActionStrip and grid action components - Action Strip Styling #7117

• have my action strip layout respect display densities i.e. for comfortable 24px till action strip border; for cosy 16px till action strip border; for compact 12px till action strip border. The spacing between the actions is not affected by the display density and is 4px between actions

• Remove id and isMenu @inputs

• Implement navigate to disabled row

• Inject Action Strip to grid aciton child and use its context to retrieve the current context and grid, also remove the @inputs for grid and context

• Topic - Action Strip - Topic igniteui-docfx#1841

• Sample - Action Strip - Sample igniteui-angular-samples#1872